A126068 - cp's OEIS frontend

A126068 Expansion of 1 - x - sqrt(1 - 2x - 3x^2) in powers of x.

n	a(n)
0	0
1	0
2	2
3	2
4	4
5	8
6	18
7	42
8	102
9	254
10	646
11	1670
12	4376
13	11596
14	31022
15	83670
16	227268
17	621144
18	1706934
19	4713558
20	13072764
21	36398568
22	101704038
23	285095118
24	801526446
25	2259520830
26	6385455594
27	18086805002
28	51339636952
29	146015545604

[0, 0, 2, 2, 4, 8, 18, 42, 102, 254, 646, 1670, 4376, 11596, 31022, 83670, 227268, 621144, 1706934, 4713558, 13072764, 36398568, 101704038, 285095118, 801526446, 2259520830, 6385455594, 18086805002, 51339636952, 146015545604]

cp's OEIS Frontend

A126068 Expansion of 1 - x - sqrt(1 - 2x - 3x^2) in powers of x.

Table of values

List of values

cp's OEIS Frontend

A126068 Expansion of 1 - x - sqrt(1 - 2*x - 3*x^2) in powers of x.

Table of values

List of values

A126068 Expansion of 1 - x - sqrt(1 - 2x - 3x^2) in powers of x.